I've never been a strong advocate of packaged protein drinks, powders and supplements. Even though the advice to consume some protein and carbohydrate after a workout is well-founded, you can get this effective combination in plain milk -- or even flavored milk if you need a little more carbohydrate after a strenuous session.
Now, Consumer Reports has analyzed a range of commercial protein powders and liquids and found that some have excessive quantities of toxic metals like arsenic, cadmium, mercury and lead, which is even more reason to go easy on the commercial protein supplements.
In addition, a recent study in the journal Medicine and Science in Sports and Exercise found that milk after weight training was a perfectly effective muscle building agent (compared to carbohydrate drinks) in women weight trainers. This study added to a similar, previous study in which milk was superior to soy or carbohydrate drinks in male weight trainers.
The bottom line here is: Don't waste your money on expensive protein powders and drinks when a simple, effective, inexpensive and 'clean' product is already abundantly available.
Med Sci Sports Exerc. 2010 Jun;42(6):1122-30. Body composition and strength changes in women with milk and resistance exercise. Josse AR, Tang JE, Tarnopolsky MA, Phillips SM.
Am J Clin Nutr. 2007 Aug;86(2):373-81. Consumption of fat-free fluid milk after resistance exercise promotes greater lean mass accretion than does consumption of soy or carbohydrate in young, novice, male weightlifters. Hartman JW, Tang JE, Wilkinson SB, Tarnopolsky MA, Lawrence RL, Fullerton AV, Phillips SM.